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We report the low temperature magnetic properties of Nd$^{3+}$ pyrochlore$\rm Nd_2ScNbO_7$. Susceptibility and magnetization show an easy-axis moment,and heat capacity reveals a phase transition to long range order at$T_N=371(2)$ mK with a fully recovered $\Delta S = R \ln(2)$, 53\% of itrecovered for $T>T_N$. Elastic neutron scattering shows a long-rangeall-in-all-out magnetic order with low-$Q$ diffuse elastic scattering.Inelastic neutron scattering shows a low-energy flat-band, indicating amagnetic Hamiltonian similar to $\rm Nd_2Zr_2O_7$. Nuclear hyperfineexcitations measured by ultra-high-resolution neutron backscattering indicatesa distribution of static electronic moments below $T_N$, which may be due toB-site disorder influencing Nd crystal electric fields. Analysis of heatcapacity data shows an unexpected $T$-linear or $T^{3/2}$ term which isinconsistent with conventional magnon quasiparticles, but is consistent withfractionalized spinons or gapless local spin excitations. We use legacy data toshow similar behavior in $\rm Nd_2Zr_2O_7$. Comparing local static moments alsoreveals a suppression of the nuclear Schottky anomaly in temperature,evidencing a fraction of Nd sites with nearly zero static moment, consistentwith exchange-disorder-induced random singlet formation. Taken together, thesemeasurements suggest an unusual fluctuating magnetic ground state which mimicsa spin-liquid -- but may not actually be one.

Beyond magnons in Nd2ScNbO7: An Ising pyrochlore antiferromagnet with all in all out order and random fields